It should be easy for Bob to find more time to spend with his children while he no longer has to work in the evenings and on weekends.
while he no longer has to work
because he no longer has to work
略
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while 不表示原因吗？句中有一种与之前情况的对比啊
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while 不表示原因吗？句中有一种与之前情况的对比啊
while表示对比，或同时。
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